Abstract
Main conclusion
pRbcS-T1 and pMALD1, two new trichome-specific promoters of Nicotiana tabacum, were identified and their strength and specificity were compared to those of previously described promoters in this species.
Abstract
Nicotiana tabacum has emerged as a suitable host for metabolic engineering of terpenoids and derivatives in tall glandular trichomes, which actively synthesize and secrete specialized metabolites. However, implementation of an entire biosynthetic pathway in glandular trichomes requires the identification of trichome-specific promoters to appropriately drive the expression of the transgenes needed to set up the desired pathway. In this context, RT-qPCR analysis was carried out on wild-type N. tabacum plants to compare the expression pattern and gene expression level of NtRbcS-T1 and NtMALD1, two newly identified genes expressed in glandular trichomes, with those of NtCYP71D16, NtCBTS2α, NtCPS2, and NtLTP1, which were reported in the literature to be specifically expressed in glandular trichomes. We show that NtRbcS-T1 and NtMALD1 are specifically expressed in glandular trichomes like NtCYP71D16, NtCBTS2α, and NtCPS2, while NtLTP1 is also expressed in other leaf tissues as well as in the stem. Transcriptional fusions of each of the six promoters to the GUS-VENUS reporter gene were introduced in N. tabacum by Agrobacterium-mediated transformation. Almost all transgenic lines displayed GUS activity in tall glandular trichomes, indicating that the appropriate cis regulatory elements were included in the selected promoter regions. However, unlike for the other promoters, no trichome-specific line was obtained for pNtLTP1:GUS-VENUS, in agreement with the RT-qPCR data. These data thus provide two new transcription promoters that could be used in metabolic engineering of glandular trichomes.
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Acknowledgements
The authors are grateful to Joseph Nader for his technical contribution. This work was supported by the Belgian Fund for Scientific Research (Grant ID: MIS—F.4522.17), the Interuniversity Poles of Attraction Program (Belgian State, Scientific, Technical and Cultural Services), and an EU Marie Skłodowska-Curie fellowship (Project ID: 658932) to MP.
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Pottier, M., Laterre, R., Van Wessem, A. et al. Identification of two new trichome-specific promoters of Nicotiana tabacum. Planta 251, 58 (2020). https://doi.org/10.1007/s00425-020-03347-9
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DOI: https://doi.org/10.1007/s00425-020-03347-9